linux-kernel - pidns memory leak

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Date:	Fri, 02 Oct 2009 14:27:04 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Pavel Emelianov <xemul@...nvz.org>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>
CC:	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: pidns memory leak

Hi,

I am facing a problem with the pid namespace when I launch the following 
lxc commands:

lxc-execute -n foo sleep 3600 &
ls -al /proc/$(pidof lxc-init)/exe && lxc-stop -n foo

All the processes related to the container are killed, but there is 
still a refcount on the pid_namespace which is never released.
That can be verified in /proc/slabinfo. Running a test suite with 
thousand of tests quickly exhaust the memory and the oom killer is 
triggered.

Reproduced with a 2.6.31 vanilla kernel on i686 and x86_64 architecture.

Thanks
   -- Daniel

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